Electrical controller



w. H. HOLDER. ELECTRICAL CONTROLLER.

APPLICATION FILED JUNE 14. 1918.

Patented Sept. 14, 1920.

, groups, the respective groups being located UNITED STATES PATENT OFFICE.

WILLIAM H. HOLDER, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE CUTLER- HAMMER MFG. 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WIS- CONSIN.

ELECTRICAL CONTROLLER.

Specification of Letters Patent.

Patented Sept. 14, 1920.

Application filed June 14, 1918. Serial No. 240,092.

a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Electrical Controllers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

This invention relates to electrical controllers of the rotatable drum type.

Among the objects of the invention is to provide a controller of the character stated wherein the various operative parts are so arranged as to occupy a minimum of space andto be fully and readily accessible.

A further object is to provide in controllers of the character stated, means facilitating the arrangement and assembly of certain of the fixed contacts in opposed relation to other of said contacts while maintaining the necessary insulation therebetween.

Other objects and advantages will hereinafter appear.

In the accompanying drawing, wherein is illustrated an embodiment of the invention,

Figure 1 is an end view of the controller; while,

Fig. 2 is a fragmentary side elevational view further illustrating certain details;

Referring to the drawing, the same illus trates a controller drum 1 rotatably mounted within suitable brackets 2, the latter being secured to an insulating support or base 3 by means of bolts 4. A plurality of contact segments 5 are peripherally secured to the drum 1 and adapted to cotiperate with relatively fixed contact fingers 6 pivotally and resiliently carried by a finger board 7 which is fixedly mounted upon suitable extended portions 8 of the brackets 2.

The contact fingers 6 are arranged in two upon opposite sides of the fingerboard 7 to extend upon opposite sides of the drum 1, corresponding pairs of fingers being arranged in the same plane transversely of the drum and finger board, the latter having substantially plane side surfaces 9. 10 for connection of the contact fingers thereto.

Each of the contact fingers 6 is pivotally mounted upon a finger support 11 having a stop for limiting movement of the finger in one direction, while a spring 12 serves to bias said finger against said stop in a well known manner. Said finger supports 11 are rigidly mounted upon the finger board 7 b means of bolts 13, each of said bolts having its head countersunk below the opposite surface of said finger board, as illustrated. Furthermore, each of said bolts is also utilized for attachment of a terminal 14 for the respective contact fingers. For insuring accurate positioning of the finger supports each of the same is provided with an additional positioning stud 15 screwed therewithin from the opposite side of the finger board and having its head countersunk as shown.

In order to permit mounting of the contact fingers upon both sides of the finger board and in the same transverse plane as described, the opposite sets of finger supports are relatively staggered laterally of the finger board, as illustrated, whereby the bolt heads of one finger support are not covered by the opposite finger support.

Furthermore, in order to permit the use of contact fingers of equal length on both sides of the finger board and also to insure that the effective radii of said fingers shall bear a tangential relation to the controller drum at their respective points of contact therewith, the finger board is so arranged with respect to said drum that the surfaces 9 and 10 are disposed angularly to the plane of symmetry of the groups of contact fingers with respect to the center of the drum. The projecting portions 8 of the brackets 2 are therefore provided with attaching surfaces at a suitable angle to said plane of symmetry, the finger board being secured directly to said surfaces of the bracket portions.

1 Since the contact fingers upon opposite sides of the finger board extend at different angles from the attaching surfaces of the latter, the finger supports on opposite sides of said finger board are bent at different angles but are otherwise, in all respects, similar.

By the above arrangement the pivot points of the contact fingers are all located symmetrically with respect to the center of the drum irrespective of the staggered mounting of the contact supports, while assembly of the controller is greatly facili tated. 1 v

The hereinbefore described mechanism is housed wlthm a casing 16shown 1n broken lines "and which is preferably formed integral with the base 3 or rigidly secured thereto, said casing being provided with'a removable top cover 17.

It is thus obvious that owing to the particular arrangement described the active parts of the controller are rendered accessible for inspection or repair upon removal of the cover 17, while the length ofthe controller necessary to provide for a given number of contacts is materially reduced without substantial increase in other dimensions. a

lVhat l' claim as new and desire to secure by Letters Patent is:

suaoortin means for said fin ers saidmeans providing for support of said fingers in an opposed relation in the same plane transverse with respect to the axis of said drum to engage the latter at substantially diametrically opposed points and in a stag-,

gered relation withrespect to said supportmg means. a a

3. In combination a rotatable drum, a plurality of contact fingers of. uniform length arranged symmetrically with respect thereto, and common supporting means for said contact fingers having opposed surfaces arranged angularly to the plane of symmetry of said fingers with respect to the a center of said drum to providefor mount ing of said fingers in an opposed relation upon said surfaces to engage said drum tangentially and at substantially diametrically opposed points, the fingers mounted upon the respective opposed surfaces of said supporting means being relatively staggered laterally of said supporting means. I

l. In combination, a rotatable drunn'a plurality of contact fingers of uniform length arranged symmetrically with respect thereto, and common supporting means for said contact fingers .having opposed surfaces e said drum at substantially diametrr arranged angularly to the plane of symnnetry of said fingers with respect to the center of said drum to provide for mounting of said fingers in an opposed relation upon said surfaces to engagesaid drum tangentially and at substantially diametrically opposed points, the fingers mounted upon the respective opposed surfaces of said supporting means being relatively staggered laterally of said supporting means, and a housing for said parts having a removable cover located adjacent said supporting means for rendering all of said fingers readily accessible. .v v V 5. In combination, a rotatable drum," a plurality of contact fingers of uniform length arranged symmetrically with re-.

spect thereto and in opposed relation to one another in planes perpendicular to the axis 1 of said drum for cooperation therewith and supporting means for said contact fingers comprising a plurality of finger. supports havin said contact fin ers ivotall. mountg a y ed thereon respectively and a rigidly secured finger board having opposed mounting surfaces to wh ch said finger supports are bolted in opposed relation, the finger supports thus opposed to one another being relatively staggered laterally of said, finger board to provide for spacing of each finger support from the securing bolt of theopposed finger'supportq 6. In combination, a rot'atable drum, a

plurality of contact fingers of uniform length arranged symmetrically with respect thereto and in opposed relation to one another in planes perpendicular to the axis of said drum for cooperation therewith and supporting means for said contact fingers comprlsmg a plurallty of finger supports having said contact fingers pivotally mounted thereon respectively and a rigidly secured finger board having opposed mounting surfaces to wlnch "said; finger supports are bolted in opposed relation, the finger supports thus opposed to one another being relatively staggered late-rally of said finger board to provide for spacing'of each finger support from the securing bolt. of the opposed finger support,w said mounting surfaces of said finger board being arranged angularlyto the plane of symmetry of said contact fingers with respect to the center of g said' drum for causing said opposed contact fingers to coeperate with sa d drum tangena tially and at substantially diametrically opposed points. I V V V I In witness whereof, I have hereunto subscribed my name. I H WILLIAM ILHO DER. 

